Self-Assembly of Di(pyrazol-1-yl)pyridine-benzoic Acid on Underpotentially Deposited Ag from Solution

Monolayers of 4-(2,6-di(1 H-pyrazol-1-yl)pyridine-4-yl)benzoic acid (DPP-BA) on Au substrates modified by an underpotential-deposited bilayer of Ag were studied by X-ray photoelectron spectroscopy (XPS), near edge X-ray absorption fine structure spectroscopy, and scanning tunneling microscopy. Highl...

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Veröffentlicht in:Langmuir : the ACS journal of surfaces and colloids. - 1992. - 34(2018), 33 vom: 21. Aug., Seite 9654-9664
1. Verfasser: Aitchison, Hannah (VerfasserIn)
Weitere Verfasser: Ortiz de la Morena, Rodrigo, Peifer, Raphael, Omar, Suhad, Lu, Hao, Francis, Stephen M, Zharnikov, Michael, Grohmann, Andreas, Buck, Manfred
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2018
Zugriff auf das übergeordnete Werk:Langmuir : the ACS journal of surfaces and colloids
Schlagworte:Journal Article Research Support, Non-U.S. Gov't
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520 |a Monolayers of 4-(2,6-di(1 H-pyrazol-1-yl)pyridine-4-yl)benzoic acid (DPP-BA) on Au substrates modified by an underpotential-deposited bilayer of Ag were studied by X-ray photoelectron spectroscopy (XPS), near edge X-ray absorption fine structure spectroscopy, and scanning tunneling microscopy. Highly crystalline layers are formed with molecules coordinatively bonding to the surface through the carboxylate moiety in a bidentate configuration. The molecules assemble to rows characterized by densely packed upright-orientated DPP units occupying an area of 41 Å2. The DPP units adopt a trans-trans conformation as inferred from the N 1s XPS spectra taken at different photon energies. Their alignment alternates between adjacent rows, giving rise to a herringbone pattern. The pronouncedly different structure of the weakly commensurate self-assembled monolayer (SAM) of DPP-BA on Ag compared to the commensurate SAM of a DPP thiol on Au is a manifestation of the shift from substrate-directed assembly in the latter case to assembly dominated by intermolecular interactions in the former case 
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700 1 |a Ortiz de la Morena, Rodrigo  |e verfasserin  |4 aut 
700 1 |a Peifer, Raphael  |e verfasserin  |4 aut 
700 1 |a Omar, Suhad  |e verfasserin  |4 aut 
700 1 |a Lu, Hao  |e verfasserin  |4 aut 
700 1 |a Francis, Stephen M  |e verfasserin  |4 aut 
700 1 |a Zharnikov, Michael  |e verfasserin  |4 aut 
700 1 |a Grohmann, Andreas  |e verfasserin  |4 aut 
700 1 |a Buck, Manfred  |e verfasserin  |4 aut 
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